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2dd9c257fb
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Joe Thornber 2dd9c257fb dm thin: support read only external snapshot origins 
Support the use of an external _read only_ device as an origin for a thin
device.

Any read to an unprovisioned area of the thin device will be passed
through to the origin.  Writes trigger allocation of new blocks as
usual.

One possible use case for this would be VM hosts that want to run
guests on thinly-provisioned volumes but have the base image on another
device (possibly shared between many VMs).

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2012-03-28 18:41:28 +01:00
..
accessibility
acpi
amba
ata 1) AHCI regression fix. A recent "make driver conform to spec" change 2012-03-22 20:22:30 -07:00
atm eni: fix driver remove function and driver probe error path. 2012-03-16 23:13:20 -07:00
auxdisplay
base Things are really quieting down with the regmap API, while we're still 2012-03-22 20:33:14 -07:00
bcma
block Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
bluetooth
cdrom
char Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-03-22 13:08:22 -07:00
clk
clocksource Power management updates for 3.4 2012-03-21 10:15:51 -07:00
connector
cpufreq
cpuidle
crypto Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-03-22 18:15:32 -07:00
dca
devfreq PM / devfreq: add relation of recommended frequency. 2012-03-17 21:51:34 +01:00
dio
dma Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-03-20 21:12:50 -07:00
edac edac: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:17 +08:00
eisa
firewire IEEE 1394 (FireWire) subsystem updates post v3.3: 2012-03-22 20:31:15 -07:00
firmware
gpio Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
gpu Merge branch 'drm-nouveau-destage' of git://people.freedesktop.org/~airlied/linux 2012-03-22 13:27:02 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2012-03-22 20:20:18 -07:00
hv
hwmon hwmon changes for v3.4 2012-03-21 10:37:25 -07:00
hwspinlock
i2c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-03-22 13:08:22 -07:00
ide ide: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:17 +08:00
idle drivers/idle/intel_idle.c: fix confusing code identation 2012-03-21 17:54:54 -07:00
ieee802154
infiniband Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2012-03-22 12:38:04 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2012-03-22 20:20:18 -07:00
iommu Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-22 09:30:39 -07:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-03-20 21:04:47 -07:00
leds
lguest
macintosh Core device tree changes for Linux v3.4 2012-03-21 10:30:03 -07:00
mca
md dm thin: support read only external snapshot origins 2012-03-28 18:41:28 +01:00
media Merge branch 'kmap_atomic' of git://github.com/congwang/linux 2012-03-21 09:40:26 -07:00
memstick memstick: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:19 +08:00
message
mfd Things are really quieting down with the regmap API, while we're still 2012-03-22 20:33:14 -07:00
misc Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
mmc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
mtd Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
net Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
nfc
nubus
of Core device tree changes for Linux v3.4 2012-03-21 10:30:03 -07:00
oprofile tidy up after d_make_root() conversion 2012-03-20 21:29:37 -04:00
parisc
parport
pci Features: 2012-03-22 20:16:14 -07:00
pcmcia
pinctrl
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-22 09:43:22 -07:00
pnp
power Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-03-20 21:12:50 -07:00
pps
ps3
ptp phc: Update author's email address. 2012-03-17 01:41:43 -07:00
rapidio
regulator regulator: Updates for 3.4 2012-03-21 10:34:56 -07:00
rtc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-20 10:32:09 -07:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-03-22 18:15:32 -07:00
sbus
scsi SCSI updates on 20120319 2012-03-22 12:55:29 -07:00
sfi
sh
sn
spi SPI changes for v3.4. 2012-03-21 10:32:00 -07:00
ssb Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-03-20 21:04:47 -07:00
staging Cleanups: rename of flush to invalidate, moving reporting of statistics 2012-03-22 19:52:47 -07:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2012-03-22 12:38:04 -07:00
tc
thermal
tty Pinctrl updates for v3.4: 2012-03-22 20:25:50 -07:00
uio
usb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
uwb
vhost vhost: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00
video fbdev updates for 3.4 2012-03-22 20:43:40 -07:00
virt
virtio
vlynq
w1
watchdog Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
xen Features: 2012-03-22 20:16:14 -07:00
zorro
Kconfig
Makefile